condition mean min max ZT0-3 1.1475052834166666 1.0620912613333333 1.2329193054999998 ZT4-7 0.7188447878333333 0.557565069 0.8801245066666666 ZT8-11 1.415072257 1.342428981 1.487715533 ZT12-15 0.8818422450000001 0.7115565620000001 1.052127928 ZT16-19 1.0230954635 0.8385739629999999 1.207616964 ZT20-23 1.364332624 1.188630589 1.540034659